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BUG: KCSAN: data-race in exit_signals / get_task_exe_file

write to 0xffff888125bd806c of 4 bytes by task 30476 on cpu 1:
 exit_signals+0xe1/0x4a0 kernel/signal.c:2873
 do_exit+0x194/0x1560 kernel/exit.c:781
 do_group_exit+0x19b/0x1a0 kernel/exit.c:922
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888125bd806c of 4 bytes by task 30477 on cpu 0:
 get_task_exe_file+0x44/0x140 kernel/fork.c:1196
 proc_exe_link+0x44/0x100 fs/proc/base.c:1725
 proc_pid_get_link+0x50/0xb0 fs/proc/base.c:1750
 pick_link fs/namei.c:1737 [inline]
 step_into+0x974/0xec0 fs/namei.c:1799
 walk_component+0x190/0x350 fs/namei.c:1949
 lookup_last fs/namei.c:2398 [inline]
 path_lookupat+0x12d/0x570 fs/namei.c:2422
 filename_lookup+0xff/0x390 fs/namei.c:2455
 kern_path+0x2e/0x40 fs/namei.c:2542
 create_local_trace_uprobe+0x3f/0x3c0 kernel/trace/trace_uprobe.c:1592
 perf_uprobe_init+0xbe/0x140 kernel/trace/trace_event_perf.c:323
 perf_uprobe_event_init+0xde/0x140 kernel/events/core.c:9754
 perf_try_init_event+0x21a/0x400 kernel/events/core.c:11071
 perf_init_event kernel/events/core.c:11123 [inline]
 perf_event_alloc+0x7eb/0x14d0 kernel/events/core.c:11403
 __do_sys_perf_event_open kernel/events/core.c:11883 [inline]
 __se_sys_perf_event_open+0x5c9/0x25c0 kernel/events/core.c:11775
 __x64_sys_perf_event_open+0x63/0x70 kernel/events/core.c:11775
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 30477 Comm: syz-executor.0 Tainted: G        W         5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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